Segment Reporting - Condensed Statements of Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	$ 2,758	$ 2,968
Other revenues from operations	187	168
Net (loss) gain from investment activities	(443)	939
Interest and dividend income	171	42
Other (loss) income, net	(32)	(24)
Total revenues	2,641	4,093
Cost of goods sold	2,260	2,538
Other expenses from operations	158	137
Selling, general and administrative	229	301
Loss on deconsolidation of subsidiary	226
Interest expense	142	134
Total Expenses	3,015	3,110
Income (loss) before income tax benefit (expense)	(374)	983
Income tax (expense) benefit	16	(98)
Net (loss) income	(358)	885
Less: net (loss) income from continuing operations attributable to non-controlling interests	(88)	562
Net (loss) income from continuing operations attributable to Icahn Enterprises	(270)	323
Capital expenditures	58	55
Depreciation and amortization	122	122
Investment Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	0	0
Other revenues from operations	0	0
Net (loss) gain from investment activities	(443)	908
Interest and dividend income	144	40
Other (loss) income, net	(28)	(17)
Total revenues	(327)	931
Cost of goods sold	0	0
Other expenses from operations	0	0
Selling, general and administrative	3	4
Loss on deconsolidation of subsidiary	0
Interest expense	45	32
Total Expenses	48	36
Income (loss) before income tax benefit (expense)	(375)	895
Income tax (expense) benefit	0	0
Net (loss) income	(375)	895
Less: net (loss) income from continuing operations attributable to non-controlling interests	(204)	481
Net (loss) income from continuing operations attributable to Icahn Enterprises	(171)	414
Capital expenditures	0	0
Depreciation and amortization	0	0
Energy Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	2,286	2,373
Other revenues from operations	0	0
Net (loss) gain from investment activities	0	0
Interest and dividend income	5	0
Other (loss) income, net	3	(10)
Total revenues	2,294	2,363
Cost of goods sold	1,926	2,123
Other expenses from operations	0	0
Selling, general and administrative	46	45
Loss on deconsolidation of subsidiary	0
Interest expense	23	24
Total Expenses	1,995	2,192
Income (loss) before income tax benefit (expense)	299	171
Income tax (expense) benefit	(52)	(30)
Net (loss) income	247	141
Less: net (loss) income from continuing operations attributable to non-controlling interests	115	80
Net (loss) income from continuing operations attributable to Icahn Enterprises	132	61
Capital expenditures	44	26
Depreciation and amortization	84	83
Automotive Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	287	407
Other revenues from operations	170	156
Net (loss) gain from investment activities	0	0
Interest and dividend income	0	0
Other (loss) income, net	0	2
Total revenues	457	565
Cost of goods sold	193	267
Other expenses from operations	145	126
Selling, general and administrative	132	208
Loss on deconsolidation of subsidiary	0
Interest expense	0	1
Total Expenses	470	602
Income (loss) before income tax benefit (expense)	(13)	(37)
Income tax (expense) benefit	0	9
Net (loss) income	(13)	(28)
Less: net (loss) income from continuing operations attributable to non-controlling interests	0	0
Net (loss) income from continuing operations attributable to Icahn Enterprises	(13)	(28)
Capital expenditures	10	21
Depreciation and amortization	19	20
Food Packaging Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	118	101
Other revenues from operations	0	0
Net (loss) gain from investment activities	0	0
Interest and dividend income	0	0
Other (loss) income, net	(7)	1
Total revenues	111	102
Cost of goods sold	91	81
Other expenses from operations	0	0
Selling, general and administrative	14	13
Loss on deconsolidation of subsidiary	0
Interest expense	3	1
Total Expenses	108	95
Income (loss) before income tax benefit (expense)	3	7
Income tax (expense) benefit	4	(1)
Net (loss) income	7	6
Less: net (loss) income from continuing operations attributable to non-controlling interests	1	1
Net (loss) income from continuing operations attributable to Icahn Enterprises	6	5
Capital expenditures	2	4
Depreciation and amortization	7	7
Real Estate Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	7	17
Other revenues from operations	16	11
Net (loss) gain from investment activities	0	0
Interest and dividend income	0	0
Other (loss) income, net	0	0
Total revenues	23	28
Cost of goods sold	6	10
Other expenses from operations	13	11
Selling, general and administrative	4	4
Loss on deconsolidation of subsidiary	0
Interest expense	0	0
Total Expenses	23	25
Income (loss) before income tax benefit (expense)	0	3
Income tax (expense) benefit	0	0
Net (loss) income	0	3
Less: net (loss) income from continuing operations attributable to non-controlling interests	0	0
Net (loss) income from continuing operations attributable to Icahn Enterprises	0	3
Capital expenditures	2	4
Depreciation and amortization	3	3
Home Fashion Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	40	55
Other revenues from operations	0	0
Net (loss) gain from investment activities	0	0
Interest and dividend income	0	0
Other (loss) income, net	0	0
Total revenues	40	55
Cost of goods sold	32	45
Other expenses from operations	0
Selling, general and administrative	10	11
Loss on deconsolidation of subsidiary	0
Interest expense	0	0
Total Expenses	42	56
Income (loss) before income tax benefit (expense)	(2)	(1)
Income tax (expense) benefit	0	0
Net (loss) income	(2)	(1)
Less: net (loss) income from continuing operations attributable to non-controlling interests	0	0
Net (loss) income from continuing operations attributable to Icahn Enterprises	(2)	(1)
Capital expenditures	0	0
Depreciation and amortization	2	2
Pharma Segment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	20	15
Other revenues from operations	1	1
Net (loss) gain from investment activities	0	0
Interest and dividend income	0	0
Other (loss) income, net	0	1
Total revenues	21	17
Cost of goods sold	12	12
Other expenses from operations	0	0
Selling, general and administrative	13	10
Loss on deconsolidation of subsidiary	0
Interest expense	0	0
Total Expenses	25	22
Income (loss) before income tax benefit (expense)	(4)	(5)
Income tax (expense) benefit	0	0
Net (loss) income	(4)	(5)
Less: net (loss) income from continuing operations attributable to non-controlling interests	0	0
Net (loss) income from continuing operations attributable to Icahn Enterprises	(4)	(5)
Capital expenditures	0	0
Depreciation and amortization	7	7
Holding Company
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Net sales	0	0
Other revenues from operations	0	0
Net (loss) gain from investment activities	0	31
Interest and dividend income	22	2
Other (loss) income, net	0	(1)
Total revenues	22	32
Cost of goods sold	0	0
Other expenses from operations	0	0
Selling, general and administrative	7	6
Loss on deconsolidation of subsidiary	226
Interest expense	71	76
Total Expenses	304	82
Income (loss) before income tax benefit (expense)	(282)	(50)
Income tax (expense) benefit	64	(76)
Net (loss) income	(218)	(126)
Less: net (loss) income from continuing operations attributable to non-controlling interests	0	0
Net (loss) income from continuing operations attributable to Icahn Enterprises	(218)	(126)
Capital expenditures	0	0
Depreciation and amortization	$ 0	$ 0